A formal test of the theory of universal common ancestry

@article{Theobald2010AFT,
  title={A formal test of the theory of universal common ancestry},
  author={Douglas L. Theobald},
  journal={Nature},
  year={2010},
  volume={465},
  pages={219-222}
}
Universal common ancestry (UCA) is a central pillar of modern evolutionary theory. As first suggested by Darwin, the theory of UCA posits that all extant terrestrial organisms share a common genetic heritage, each being the genealogical descendant of a single species from the distant past. The classic evidence for UCA, although massive, is largely restricted to ‘local’ common ancestry—for example, of specific phyla rather than the entirety of life—and has yet to fully integrate the recent… 

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TLDR
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TLDR
It is argued that LGT poses insurmountable challenges for detailed and rich in details reconstructions and proposed a middle-ground position with the reconstruction of a slim LCA based on traits under strong pressures of Negative Natural Selection, and for the need of consilience with evidence from organismal biology and geochemistry.
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